Question

Chemistry 326 Laboratory Manual obowy zawabnya CH, HycoF OCH Pre-Lab Assignment: Complete BEFORE Lab! (5 pts) 1. Draw the ketones and aldehydes necessary to synthesize ALL compounds A-F via double Aldol condensation. 2. Determine the moles of acetone and the moles of benzaldehyde used in the sample procedure below. NOTE: you will need to find the density of acetone and benzaldehyde to do this exercise. 3. Using the same number of moles you calculated above, determine the VOLUME of each aldehyde and ketone needed to synthesize ALL compounds A-F via Aldol condensation. NOTE: you will need to find the density of the starting compounds to do this exercise. Turn this pre-lab exercise on a separate sheet of paper BEFORE lab. Also, make a copy for yourself to use during lab. SAMPLE PROCEDURE FOR DOUBLE ALDOL CONDENSATION NOTE: for the actual experiment to make A-F substitute the amount of aldehyde and ketone you calculated in the pre-lab experiment. Add 0.37 mL of acetone (NOTE: substitute the correct amount of your assigned starting material here), 1.0 mL of benzaldehyde (NOTE: substitute the correct amount of your assigned starting material here), 10 mL of 10% NaOH, and 10 mL of cthyl alcohol (ethanol) to a 125-mL Erlenmeyer flask. Rapidly stir the mixture with a magnetic stirrer for at least 20 minutes (NOTE: if you don't see ewidence of a reaction after 2 minutes, hear the reaction gently on a hot plate). The reaction mixture should at first be clear and homogeneous, but should shortly become milky with yellow solid particles of product visible. Collect the solid by suction filtration, using cold water to completely transfer and thoroughly wash the product. Turn off the suction, carefully break up the crystalline mass with a spatula, and add to the solid on the filter 5 mL of an ice-cold solution containing 5% acetic acid in ethanol. Allow the suspension to stand for 30 to 60 seconds and then remove the liquid by reapplying the suction. Turn off the suction, carefully break up the

Answer 1

1,3 > 0 + 2 mol.cota 98.15 Density = 0.947 90 volume = 0.52 ML 106 1049) 1.0 mL B] m.: 120.14 D: 1.019 9mL : 1.6 ml 98.15 0.947 g/ 0.52 OL L CHO 2 ET meó mw: 136.15 D: 1.119.9/mL V: 1.20 OL. Deo 98:15 .947 g/mol 0.52 L CHO * $-5-bo 1.00L mu:84.12 210.gs gimL vio.44.0L muo: 84.12 0:0.95.9) v0.44 mL V=1.16 m2

Ons roco v 84.12 D! 0.95 g/m =1-90 5L : : Only 2) rooloo mass of Accone = 58.08 g/mol Density = 0.784 g/mL USS 5. densing - home volumen :: MUSS = 0.784 % 0.37 ML = 0.290 gm i mole of acetone = 58.08 9 :. 0.250 9. acetone = / 0.290 x)) mole of ( 58.08 ) ocetone = 0.004993 mol = 4.993 romol cicetone Density of benzaldehyde = 1.04 g/mol Limass = 1.04% 1.0 = 1.04 g 1 pole of Pb CHO = 10G 8 of Pb- CHO :. |0- 8 phy CHO = (10/11) 9,81) ĐỒol of Ph: CHO